Tool grinder



W. E. LUTZl TooL GRINDER March 4, 1930.'

Filed Nov. 18. 1925 'l Y idPratentedMar. 4, 1930 PATENT o'FFlcE 'rooLGniNDER Appli'catiouled November v l @Thisiinvention 'relates toMimprovements in sharpening apparatus and has for -its prime 7 object toprovide asimple and'eiflcient'sharpener designed to quicklyandefticientlysharp'- Y o en varioustyp'es 'of butchers tools.

f r A further object of the invention is the pro'' visionloffasharpening-'apparatus of the above character which ,is arra-nged so 'asto'be cony veniently connected in l associationwith av 1o motor yorother' source of power.

- ,Afsaufurther object of uw inventan is the 4 provision of yanapparatus of thea'bove'type u which will be eliicient in "operation andlcan be placedl upon' thefinarllt at af' very reasonf 15 able `cost. 1

Other obj ectsand advantages'bf the inven-` tion will become apparent asthe description 'progresses f In the laccompanying drawing forming a L20part ofrthis specification and in which like numerals are `employed yto'designate corresponding parts throughout theY same: f

' Figure 1 is a side elevation of an apparatus p constructed inaccordance with my invention,

25 'partially broken away to show the interior construction, A f ,f I

Figure. 2 isr a transversev sectional view taken on the line 2 2 ofFigure 1, Figure 3 is an enlarged verticalsectional viev through one ofthe tool holding devices, an v Figure 4 is a transverse sectional viewtaken on the line 4-4 of-Figure.

In' the drawing, wherein for the purpose -35 of illustration Vis shownthe preferred em.

bodiment of my invention, the numeral 5 generally indicates aconventional type of electric motor, frequently employed in butchershops for driving various kinds of machinery. This type of motorembodies a comparativa ly longshaft housing 6 extending froml one sideof the motor casing and, in the present instance, this housing isprovided with an enlarged bore adjacent the outer extremity, as shown toadvantage in Figure 1. I The mo- -ftor drive shaft 7 extends partly inthe housi v ing 6 and is provided with a rectangular bore 8,thepurposeof which will become apparent as the vdescription progresses.

50i'` Referring now more particularly to the 18, i925. serial No.69,879.

structure embodying my invention, the numeral 9 generally indicates alongitudinal grinder shaft, the greater portion ofwhich is ofnon-'circular'crosfs section, preferably square, having an intermediatecomparative- 55 ly shortcylindrical portion 10.y This portion 10^islocated adjacent the attached end of the shaft as is'apparent fromFigurel of the drawing, although the forward extremityfis of squareformation and engageable in 60 theborepS formed in thezmotor drive shaft7. It isy thus seen. that the shaft 9'eXtends in a horizontal position'andis driven directly by the motor shaftff"y f f Loosely mounted uponthe shaft 9 so as to 65 be 'rotatable' about the portionI l0 is acircular headflllrecessed inonejfa'ce andA provided with an'internalgea'r 12. Fixed upon the rsurrounding the roundedv portionoftheshaft 9 and positioned in the outer end of the hous-y 80 ingf ,6,3 Thissleeve extends fheld against arotation by vmeans of al set screw 17which is through a suitable opening in the housing 6 and engagesanwaligned opening formed in the sleeve. l Formed on the forwardextremity S5 ofgthe sleeve. 16 is a vertically extending arm 18 providedon Jits jupper extremity with an outwardly directed `tubular extension19. This extension supports a shaft upon which the pinion14 isrotatablymounted. It can 90 hej-'readily seen, from the'l foregoing,that as they shaft 9 isf-rotated in onek direction by the motor 75, therhead 11 will be rotated at. a Iniichlslowerfspeed in the reverse`direction.y Secured to the face ofthe head 11 ropposite 95 thefacewhichisrecessed, are bracket armsy 2Q which 'are provided with flanges 21bolted or'otherwiseV secured to thesaid'head.A The Glutei* eldsfofthbraket armsfsupport blade' holdingfdevi'cesfeach ofwhich, asillustratedv 100 CTI in Figure l of the drawing, comprises a socketmember 28 which 1s mounted on the outer end Vof the respective arm 20and which is designed provided With a short extension which is Vhingedlyconnected With the arms 20 byrwhich y the blade holding device issupported. Ad# justably mounted in the sleeve 22 is a threaded head 23provided 'With a stem 24 which. extends through an opening inthe kend-ofthe sleeve and is provided with afinger knob 25 adapted to permitconvenient rotation of the stem and threaded disk to cause theexpanlsible sleeve 22 to bind in an opening or socket provided centrallyof the blade to be supported and sharpened. Y l VMounted on therearnon-circular v`portion of the shaft 9 is a comparativelylargef'circular grind stone 26, provided Withla hub 27laxially-sli'dable upon the shaft so that the po-v sition of the grindstone maybe adjusted relative to the tools. Y w v Y In use, it Will bereadily seen that the cir-l cularY blades of butchers slicing. machinesVthe shaft and having an internalgear portion 1 at its periphery, apinionl fixed upon the cylin-y drical portion of the shaft, a sleeveloosely surrounding the cylindrical portion of the shaft, a bracketextending from the sleeve, a

pinion rotatably mountedA upon the bracket and meshing with theinternal, gear and With the first mentioned pinion,means for holding v Yf thesleeve stationary-With respect to the housing for the motorshaft,and means upon the head for supporting' a tool in contact With the`abrading member.

head rotatably mounted Vupon the shaft, an internal gear upon theheadconcentricto the 2. In" tool'grindingapparatus, ashaft,'a

shaft,y a sleeve loosely surrounding the shaft,

a bracket memberfextending from thesleeve,

a pinion fixed upon the shaft, av pinion rotatabl-yimounted upon thebracket member and meshingwith the first mentioned pinion and with theinternal gear, means associated With the sleeve for securingthe sameWith respect to a fixed shaft, the end of the'shaft adjacent the sleevebeing of polygonalform for en'- Y v gagement in a correspondingly formedsocketv in a motor shaft, an abrading element longitudinally adj ustablymounted upon theshaft,

and means upon the head for supporting a' tool inA contact With theabrading member.r

In testimony whereof I affix mysignature. f r WILLIAM EMERY' LUTZ. i

may be mounted by thel holders 22 in` position to be acted upon by thegrindstone., The moi -i tor 5 Will effect rotation of the shaft 9 in onedirection and' due to the provision of the gear ing described,theheadll'willbe rotated at a v reduced speed in thefopposite direction,so

that the blade supporting brackets' and bladesmounted thereon willrotate inone direction and the grind stone 26 inthe other.y

The brackets are arranged so that the'blades are supported in positionflaty against the face of thek grind stone so that thek blades Will besharpened very quickly and efficiently. t

It is to be understood that the form of-my invention herewith shown and`described yis '4 susceptible of modication andfthat various Y changesasto the shape, size and arrangement of'parts may be resorted toWithout'depiarting from theV spirit of the invention, orjthe scope ofthe subjoin-ed claims.

claim Having thus described my invention, I

1. In tool grinding apparatus forapplica;

- ios'f tion to and actuation by a motor including the usual'motorpshaft having a polygonal socket polygonal portions and anintermediate cylindrical portion, one of the polygonal portionsbeingadapted to be fitted 'into the socket in 'themotor shaft, anabrading member longitudinally adju'stably mounted upon the otherpolygonal portion ofthe shaft, ahead rotat-A ably mounted upon thecylindrical portion of l rand va housing for vthe shaft, a shaft havingY

